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  1. Prepare
  2. Algorithms
  3. Strings
  4. Mars Exploration
  5. Discussions

Mars Exploration

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1062 Discussions

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  • dorirgob
     + 0 comments
    public static int marsExploration(String s) {
  // Write your code here
  int diff = 0;
  for (int i = 0; i < s.length(); i++) {
    if ((i % 3 == 0 || i % 3 == 2) && s.charAt(i) != 'S') {
      diff++;
    } else if (i % 3 == 1 && s.charAt(i) != 'O') {
      diff++;
    }
  }
  return diff;
}

  • alban_tyrex
     + 0 comments

    Here is my c++ solution, you can find the explanation here : https://youtu.be/Gf0fpGE83r4

    int marsExploration(string s) {
   int result = 0;
    string base = "SOS";
    for(int i = 0; i < s.size(); i++) if(s[i] != base[i%3]) result++;
    return result;
}

  • illogicalsleepi1
     + 0 comments
    def marsExploration(s):
    c=0
    for i in range(0,len(s)//3):
        if s[0+3*i]!='S':
            c+=1
        if s[1+3*i]!='O':
            c+=1
        if s[2+3*i]!='S':
            c+=1
        
    return c

  • vyaskeshav1652
     + 0 comments

    Java 8:

    public static int marsExploration(String s) {
        String sos = "SOS";
        int totalChangedLetters = 0;
        for (int i = 0; i < s.length(); i++) {
            if (s.charAt(i) != sos.charAt(i % 3)) {
                totalChangedLetters++;
            }
        }
        return totalChangedLetters;
    }

  • pankaj_bodade129
     + 0 comments
    public static int changedLetters(char s1, char O, char s2){
        int count=0;
        if (s1!='S') {
            count++;
        }
        if (s2!='S') {
            count++;
        }
        if (O!='O') {
            count++;
        }
        return count;
    }
    public static int marsExploration(String s) {
    // Write your code here
    int output=0;
    for (int i = 0; i < s.length(); i+=3) {
        int count=0;
        count=changedLetters(s.charAt(i+0),s.charAt(i+1),s.charAt(i+2));
        output=output+count;
        System.err.println("count="+count+"output="+output);
    }
    return output;

    }